I think my success rate with grocery store digital coupons is about 80%-90%. I don't bother to ask the self checkout attendant or the unstaffed CS line to fix t

I think my success rate with grocery store digital coupons is about 80%-90%. I don't bother to ask the self checkout attendant or the unstaffed CS line to fix the bill when a coupon doesn't go through, which I'm assuming is factored into the margins.